Gfilui

Following the Intel Powerclamp instructions (https://www.kernel.org/doc/Documentation/thermal/intel_powerclamp.txt), I tried setting the ratio using their recommended Konsole entry: sudo sh -c "echo 15 > /sys/class/thermal/cooling_device80/cur_state
" This gave an error : sh: 1: cannot create /sys/class/thermal/cooling_device80/cur_state: Directory nonexistent

EDIT 0:
I ran the commands and got:

sarah@ConvergentRefuge:~$ ll /sys/class/thermal/cooling_device*
lrwxrwxrwx 1 root root 0 Feb 9 09:01 /sys/class/thermal/cooling_device0 -> ../../devices/virtual/thermal/cooling_device0/
lrwxrwxrwx 1 root root 0 Feb 9 09:01 /sys/class/thermal/cooling_device1 -> ../../devices/virtual/thermal/cooling_device1/
lrwxrwxrwx 1 root root 0 Feb 9 09:01 /sys/class/thermal/cooling_device2 -> ../../devices/virtual/thermal/cooling_device2/
lrwxrwxrwx 1 root root 0 Feb 9 09:01 /sys/class/thermal/cooling_device3 -> ../../devices/virtual/thermal/cooling_device3/
lrwxrwxrwx 1 root root 0 Feb 9 09:01 /sys/class/thermal/cooling_device4 -> ../../devices/virtual/thermal/cooling_device4/
lrwxrwxrwx 1 root root 0 Feb 9 09:01 /sys/class/thermal/cooling_device5 -> ../../devices/virtual/thermal/cooling_device5/
lrwxrwxrwx 1 root root 0 Feb 9 09:01 /sys/class/thermal/cooling_device6 -> ../../devices/virtual/thermal/cooling_device6/
lrwxrwxrwx 1 root root 0 Feb 9 09:01 /sys/class/thermal/cooling_device7 -> ../../devices/virtual/thermal/cooling_device7/
lrwxrwxrwx 1 root root 0 Feb 9 09:01 /sys/class/thermal/cooling_device8 -> ../../devices/virtual/thermal/cooling_device8/
lrwxrwxrwx 1 root root 0 Feb 9 09:01 /sys/class/thermal/cooling_device9 -> ../../devices/virtual/thermal/cooling_device9/


But when I ran sudo sh -c "echo 15 > /sys/class/thermal/cooling_device0/cur_state"
I got an I/O Error.

The other answer is on the right track but leads to the wrong solution in my case. To track down missing files or directories use this technique:

$ ll /sys/class/thermal/cooling_device*
lrwxrwxrwx 1 root root 0 Feb 7 04:33 /sys/class/thermal/cooling_device0 -> ../../devices/virtual/thermal/cooling_device0/
lrwxrwxrwx 1 root root 0 Feb 7 04:33 /sys/class/thermal/cooling_device1 -> ../../devices/virtual/thermal/cooling_device1/
lrwxrwxrwx 1 root root 0 Feb 7 04:33 /sys/class/thermal/cooling_device2 -> ../../devices/virtual/thermal/cooling_device2/
lrwxrwxrwx 1 root root 0 Feb 7 04:33 /sys/class/thermal/cooling_device3 -> ../../devices/virtual/thermal/cooling_device3/
lrwxrwxrwx 1 root root 0 Feb 7 04:33 /sys/class/thermal/cooling_device4 -> ../../devices/virtual/thermal/cooling_device4/
lrwxrwxrwx 1 root root 0 Feb 7 04:33 /sys/class/thermal/cooling_device5 -> ../../devices/virtual/thermal/cooling_device5/
lrwxrwxrwx 1 root root 0 Feb 7 04:33 /sys/class/thermal/cooling_device6 -> ../../devices/virtual/thermal/cooling_device6/
lrwxrwxrwx 1 root root 0 Feb 7 04:33 /sys/class/thermal/cooling_device7 -> ../../devices/virtual/thermal/cooling_device7/
lrwxrwxrwx 1 root root 0 Feb 7 04:33 /sys/class/thermal/cooling_device8 -> ../../devices/virtual/thermal/cooling_device8/
lrwxrwxrwx 1 root root 0 Feb 7 04:33 /sys/class/thermal/cooling_device9 -> ../../devices/virtual/thermal/cooling_device9/

On my system cooling devices are numbered 0 to 9. There is no number 80 which you are trying to access.

Then to see the value of all 9 cur_state files use:

$ cat /sys/class/thermal/cooling_device*/cur_state
0
0
0
0
0
0
0
0
-1
0

Interesting to note that cooling_device8 is set to -1. I'm not sure why.

One of the directories in your path to cur_state either does not exist or has a broken symbolic link. It is most likely cooling_device80